code: def setUpClass(cls) -> None:
      ray.init()
  
file_path: ray/rllib/env/tests/test_single_agent_env_runner.py
imports: import unittest
  import ray
  from ray.rllib.algorithms.algorithm_config import AlgorithmConfig
  from ray.rllib.env.single_agent_env_runner import SingleAgentEnvRunner
label_desc: Use image node_id 1 for calling the TestSingleAgentEnvRunner obj's underlying member method code with example usage: obj.setUpClass(cls) without return types